Add the butter to the pressure cooker and press saute.
When the butter has melted, add the garlic and saute for about 30 seconds, then add the tomato paste and stir for about a minute, or until it begins to brown a little.
Add the crushed tomatoes and the vodka and let it boil off some of the alcohol for about a minute.
Add the rigatoni, red chile flakes, 2 ½ cups cold water, 1 teaspoon salt and some fresh ground black pepper and give it a quick stir. Lock the lid in place, set the steam valve on "sealing."
Press the manual button and then the pressure button to set the pot to Low pressure. Use the + and - buttons to set the time for 6 minutes. The pot will come up to pressure, cook for 6 minutes and then turn to keep warm.
When the time is up, do a quick pressure release by carefully turning the steam valve to open. When the pressure valve drops, unlock the lid.
Add the cream to the pasta and stir to combine. Let it sit for about 5 minutes for the sauce to thicken a bit. Then stir in the cheese and the basil. Add more salt and black pepper to taste.
Notes
Unsalted butter - can use salted, but taste sauce before seasoning.